why does it seem always windier in the city?

Expert Solution

This is called the urban canyon effect.
Tall buildings can significantly disturb airflows over urban areas, and even a building 10 yards high can deflect winds.
Denser collections of buildings in downtown districts of larger metropolitan areas can be windier than surrounding rural areas, with quite marked gusts. This is the result of the increased surface roughness that the urban skyline creates, leading to strong vortices and eddies. In some cases, these faster, turbulent winds are funneled in between buildings while barely perceptible pocket-vacuums are formed.

Bernoulli's principle enters this urban situation wherein,any velocity of a gas or liquid will increase as pressure drops .

When the wind hits a high building, the air stream divides. A part of it moves upwards and the rest goes around the building. These swirling eddies--products of Bernoulli's principle--demonstrate the Venturi Effect.

Streets with high buildings on each side of the road create wind tunnels with these small portions of spinning air. It is the main roads leading into a city that act as the main corridors by which the wind enters. These wide thoroughfares for the wind initially allow the wind to follow the direction of the street. But in the more narrow street "canyons," the wind speed is significantly increased at street corners and local eddies are additionally generated at these junctions where different air currents meet.

genius_generous answered 2 hours ago

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